Does TBCME support SHACL-JS?
Angelo Frozza
Holger Knublauch
Hi Angelo,
using TBC-FE (Free Edition), SHACL-JS does work. I have tested your previous file, fixing the www. in the label of one instance and get this:
I agree debugging JS can be difficult from a Java-based tool that goes into the JS Nashorn engine. One way to debug things is to run the JS queries separately. The JavaScript Query view in TBC-FE could be used potentially:
Basically you could write your JS code there and put them into the .js file when you are confident they work.
Other than this, feel free to send a minimal and complete example of where you are stuck, here or on the shacl w3c mailing list.
Holger
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Angelo Frozza
Angelo Frozza
Now I'm looking for some examples of javascript code that can be executed in the Javascript query view.
At first, I need to read the value of the $ this variable, then proceed with the test.
The syntax does not seem to be exactly as it will be in the function.js file.
var results = [];
var p = TermFactory.namedNode("http://www.example.org#germanLabel");
var s = $data.find($this, p, null);
for(var t = s.next(); t; t = s.next()) {
var object = t.object;
if(!object.isLiteral() || !object.language.startsWith("de")) {
results.push({
value : object
});
}
}
return results;
}
Angelo Frozza
propertyName = TermFactory.namedNode("http://www.example.org/ns#coordinates");
propertyObject = $data.find($this, propertyName, null) ;
for (t = propertyObject.next(); t; t = propertyObject.next()) {
coordTriple = propertyObject.next();
if (!coordTriple) {
return null;
}
coordinate = coordTriple.object;
if (coordinates.length < $minSize ) {
results.push({
value : coordinates
});
}
}
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Prof. Angelo Augusto Frozza, M.Sc.
http://about.me/tilfrozza
Holger Knublauch
The syntax supported in the JS Query view is based on this library
https://github.com/TopQuadrant/shacl-js/blob/master/shared/rdfquery.js
which provides syntactic sugar to more efficiently walk through RDF results.
So instead of doing a "for" loop you can use match as in
var result = $data.query().
match("owl:Class", "rdfs:label", "?label").
match("?otherClass", "rdfs:label", "?label").
filter(function(sol) { return
!T("owl:Class").equals(sol.otherClass) }).
getNode("?otherClass");
This library is also used for the implementation of most built-in constraints in TopBraid's SHACL-JS implementation, see
https://github.com/TopQuadrant/shacl-js/blob/master/shared/dash.js
Not sure if this helps or distracts in your SHACL-JS exercises,
so I just wanted to point it out.
Holger
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Angelo Frozza
Thanks again for the answer.
I accessed the two files you indicated (rdfquery.js and dash.js), but due to my inexperience in working with RDF, it is still fuzzy for me how to build a query in JS Query View.
I am trying to rewrite the function below, but still to no avail. If you can help me to build this example I would appreciate it. Perhaps I can move forward from that example.
=====
function validateGermanLabel ($ this) {
var results = [];
var p = TermFactory.namedNode ("http: //www.example.org#germanLabel");
var s = $ data.find ($ this, p, null);
for (var t = s.next (); t; t = s.next ()) {
var object = t.object;
if (! object.isLiteral () ||! object.language.startsWith ("de")) {
results.push ({
value: object
});
}
}
return results;
}